Four famous lines, poems and authors about the frontier fortress.

1. The poor bones by the Wuding River are like those in a spring boudoir dream. (Tang Dynasty. Chen Tao. "Long West Journey") 2. Why should the Qiang flute blame the willows? The spring breeze does not pass through Yumen Pass. (Wang Zhihuan of the Tang Dynasty. "Out of the Fortress") 3. The flag was rolled up and the Shanyu tent was robbed at night, and the Hu soldiers were slaughtered randomly and lacked precious swords. (Tang Dynasty. Ma Dai. "Crossing the Fortress") 4. Every year, the bones of battles are buried outside, and it is rare to see sweet apples entering the Han family.

(Tang Dynasty. Li Qi. "Ancient Military Journey")